\documentclass{beamer}
\usepackage{tikz}
\usepackage{pgfplots}
\pgfplotsset{compat=newest}
\pgfplotsset{plot coordinates/math parser=false}
\newlength\figureheight
\newlength\figurewidth


\begin{document}
\setlength\figureheight{6cm}
\setlength\figurewidth{9cm}

\begin{figure}
  \centering
  \input{img/RelErrTol1Set1.tikz}
\end{figure}

\end{document}


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%%% mode: latex
%%% TeX-master: t
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